d) changing attitudes towards work According to chapter 19 of your text book, which of the following would NOT shift the labour demand curve? a) an increase in the price of the output b) an increase in the productivity of workers c) changes in alternative opportunities d) availability of other factors of production When deciding how much labour to hire, a profit-maximising firm should hire workers until: a) marginal profit equals the wage rate b) marginal revenue equals marginal profit c) marginal product equals the wage rate d) marginal profit is zero